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Fermi-liquid, non-Fermi-liquid, and Mott phases in iron pnictides and cuprates

机译:铁素化物和铜酸盐中的费米-液相,非费米-液相和莫特相

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摘要

The role of Coulomb correlations in the iron pnictide LaFeAsO is studied by generalizing exact diagonal-ization dynamical mean-field theory to five orbitals. For rotationally invariant Hund's rule coupling a transition from a paramagnetic Fermi-liquid phase to a non-Fermi-liquid metallic phase exhibiting frozen moments is found at moderate Coulomb energies. For Ising-like exchange, this transition occurs at a considerably lower critical Coulomb energy. The correlation-induced scattering rate as a function of doping relative to half filling, i.e., δ=n/5-1, where n=6 for the undoped material, is shown to be qualitatively similar to the one in the two-dimensional single-band Hubbard model which is commonly used to study strong correlations in high-T_c,. cuprates. In this scenario, the parent Mott insulator of LaFeAsO is the half-filled n= 5 limit, while the undoped n=6 material corresponds to the critical doping region δ_c ≈ 0.2 in the cuprates, on the verge between the Fermi-liquid phase of the overdoped region and the non-Fermi-liquid pseudogap phase in the underdoped region.
机译:通过将精确的对角化动力学平均场理论推广到五个轨道,研究了库仑相关性在铁素体LaFeAsO中的作用。对于旋转不变的洪德法则,在中等库仑能量下发现了从顺磁费米液相到非费米液态金属相的转变,表现出冻结矩。对于像Ising的交换,这种转变发生在相当低的临界库仑能量下。相关引起的散射率是相对于半填充的掺杂函数,即δ= n / 5-1,其中未掺杂材料的n = 6,在质量上类似于二维单粒子带哈伯德模型,通常用于研究高T_c中的强相关性。铜币。在这种情况下,LaFeAsO的母体莫特绝缘子是半填充的n = 5极限,而未掺杂的n = 6材料对应于铜酸盐中临界掺杂区δ_c≈0.2,处于费米液相的临界状态。掺杂区和掺杂区中的非费米-液pseudo隙相。

著录项

  • 来源
    《Physical review》 |2010年第5期|p.054513.1-054513.10|共10页
  • 作者

    Hiroshi Ishida; Ansgar Liebsch;

  • 作者单位

    College of Humanities and Sciences, Nihon University, Tokyo 156, Japan;

    Institut fuer Festkoerperforschung, Forschungszentrum Juelich, 52425 Juelich, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    transition metals and alloys;

    机译:过渡金属和合金;

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